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Finding the Fourth Proportional to 305.29, 458.01 and 142.90

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Solution

The fourth proportional to 305.29, 458.01 and 142.90 is: 214.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.29 : 458.01 = 142.90 : x
  2. Step 2: Convert to fraction form
    305.29/458.01 = 142.90/x
  3. Step 3: Cross multiply
    305.29x = 458.01 × 142.90
  4. Step 4: Simplify right side
    305.29x = 65,449.63
  5. Step 5: Solve for x
    x = 65,449.63/305.29
  6. Step 6: Final answer
    x = 214.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.